在三个活动之间管理数据并返回至第一

Question

In my Activity1, I go to Activity 2 like this:

  materialSearchBar.getMenu().setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem menuItem) {
                switch(menuItem.getItemId()){
                    case R.id.searchCamera:
                        System.out.println("CAMERA GOT HERE");
                        Intent intent = new Intent(MainActivity.this,CameraText.class);
                        startActivityForResult(intent,REQ_CODE_CAMERASEARCH);
                        break;
                }
                return false;
            }
        });

In my Activity2 , I then do a process with the camera and go to Activity3 with a list of strings (this all works, the problem is with the next activity).

My Activity3:

public class SelectProductName extends AppCompatActivity {
    ArrayList<String> getString = new ArrayList<>();
    String my_string;
    private final int REQ_CODE_CAMERASEARCH = 500;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_select_product_name);
        getString = getIntent().getStringArrayListExtra("stringList");
        final TextView[] myTextViews = new TextView[getString.size()];


        LinearLayout ll = findViewById(R.id.layout_select_product_name);
        for (int i = 0; i < getString.size();i++){
            final TextView text = new TextView(this);
            text.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT));
            text.setText(getString.get(i));
            text.setTextSize(20.0f);
            System.out.println(getString.get(i));
            ll.addView(text);
            text.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent returnIntent = new Intent();
                    my_string = (String) text.getText();
                    returnIntent.putExtra("csString",my_string);
                    System.out.println("its here" + my_string);
                    setResult(REQ_CODE_CAMERASEARCH,returnIntent);
                    finish();
                }
            });
        }
    }
}

From my Activity3, I want to go back to Activity1 and in my activity1 for this code to run:

 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        switch (requestCode) {
            case REQ_CODE_CAMERASEARCH:
                if (resultCode == REQ_CODE_CAMERASEARCH && null != data){
                String str = data.getStringExtra("csValue");
                startSearch(str);
                System.out.println("CAMERA SEARCH GETS HERE");
            }
            break;

        }
    } 

But at the moment, in my Activity3 , when I click on the specific TextView and it calls finish() it goes back to Activity2 . Is there a way to override this so that it goes back to Activity1 instead as I need to use the searchStr method in OnActivityResult .

Answer 1

From Android Developer documentation.

FLAG_ACTIVITY_FORWARD_RESULT

 public static final int FLAG_ACTIVITY_FORWARD_RESULT 

If set and this intent is being used to launch a new activity from an existing one, then the reply target of the existing activity will be transferred to the new activity. This way, the new activity can call Activity.setResult(int) and have that result sent back to the reply target of the original activity.

All you need to do is

• Set FLAG_ACTIVITY_FORWARD_RESULT flag in the intent which starts Activity3 .
• Finish Activity2 after start Activity3

Put all together

Activity2

Intent intent = new Intent(this, Activity3.class);

// Set FLAG_ACTIVITY_FORWARD_RESULT flag in the intent which starts `Activity3`
intent.setFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
startActivity(intent);

// Finish Activity2
finish();